Trailer
Images
 | Akira Takaki as Muumipeikko (voice) |
 | Oiva Lohtander as Muumipappa (Finnish version) (voice) |
 | Niklas Åkerfelt as Nuuskamuikkunen / Hemuli (Finnish / Swedish version) (voice) |
 | Vesa Vierikko as Narrator / Postman (Finnish version) (voice) |
 | Maria Sid as Muumimamma / Salome / Homssumuori (Finnish / Swedish version) (voice) |
| Diandra Flores as Pikku Myy / Homssu-punapää / Mymmeli (Finnish version) (voice) |
| Saara Lehtonen as Squirrel / Surku-koira / Vilijonkka / Homssu-pellavapää (Finnish version) (voice) |
 | Nina Hedström as Tuu-Tikki / Tahmatassu / Kampsu / Nyyti (Finnish version) (voice) |
| Directing | |
| Jakub Wroński | Director |
Visual Effects | |
| Jakub Wroński | Animation |
Sound | |
| Łukasz Targosz | Original Music Composer |
| Łukasz Targosz | Orchestrator |
| Łukasz Targosz | Musician |
Production | |
| Tom Carpelan | Producer |
| Ira Carpelan | Producer |
Writing | |
| Ira Carpelan | Writer |
Directing | |
| Ira Carpelan | Director |
Production | |
| Grzegorz Wacławek | Co-Producer |
| Grzegorz Wacławek | Line Producer |
Sound | |
| Heikki Kossi | Foley Artist |
Editing | |
| Piotr Szczepanowicz | Editor |
| Jakub Wroński | Editor |
Art | |
| Piotr Szczepanowicz | Production Design |
Writing | |
| Małgorzata Więckowicz-Żyła | Writer |
Editing | |
| Przemysław Chruścielewski | Editor |
Art | |
| Ira Carpelan | Production Design |
Writing | |
| Piotr Szczepanowicz | Writer |
Sound | |
| Michał Fojcik | Sound Director |
Writing | |
| Tove Jansson | Novel |
Sound | |
| Jacek Wiśniewski | Foley Artist |
| Natalia Kukulska | Vocals |
Writing | |
| Lucjan Dembiński | Original Film Writer |
| Maria Kossakowska | Original Film Writer |
Art | |
| Bogdan Chudzyński | Original Series Design |
